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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 48
INNOVATION IN CIVIL AND STRUCTURAL ENGINEERING Edited by: B.H.V. Topping and M.B. Leeming
Paper IV.6
A Novel Approach to Lower Bound Moment Fields for the Design of Flat Plates and Flat Slabs D.H. Clyde
Department of Civil Engineering, The University of Western Australia, Nedlands, Australia D.H. Clyde, "A Novel Approach to Lower Bound Moment Fields for the Design of Flat Plates and Flat Slabs", in B.H.V. Topping, M.B. Leeming, (Editors), "Innovation in Civil and Structural Engineering", Civil-Comp Press, Edinburgh, UK, pp 161-166, 1997. doi:10.4203/ccp.48.4.6
Abstract
The paper presents a method of generating equilibrium
moment fields for flat plates and flat slabs. Column and
middle strips break the slab into panels in which fractions of
the loading which sum to unity are assigned to be carried on
Hillerborg strips in the orthogonal directions defined by the
column layout. Shears at the boundaries of the panels are
directly transmitted as downward reactions on adjacent panels
A distributed upward loading required to equilibrate these
shears and the- associated bending moment diagram is
calculated. Total downward loading on the panel is satisfied
by carrying the equilibrant of the upward loading as well as
the design loading in the orthogonal direction. In order to
transmit the strip reactions to the columns a novel
application of strong bands in the form of crossed balanced
cantilever bands is used. Finally the edge case is treated and
by extension, the same device could be applied at a corner.
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